Accelerating cosmological expansion from shear and bulk viscosity
The dissipation of energy from local velocity perturbations in the cosmological fluid affects the time evolution of spatially averaged fluid dynamic fields and the cosmological solution of Einstein’s field equations. We show how this backreaction effect depends on shear and bulk viscosity and other...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
3 March 2015
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| In: |
Physical review letters
Year: 2015, Jahrgang: 114, Heft: 9, Pages: 091301 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.114.091301 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.114.091301 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.114.091301 
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| Verfasserangaben: | Stefan Floerchinger, Nikolaos Tetradis, and Urs Achim Wiedemann |
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| 520 | |a The dissipation of energy from local velocity perturbations in the cosmological fluid affects the time evolution of spatially averaged fluid dynamic fields and the cosmological solution of Einstein’s field equations. We show how this backreaction effect depends on shear and bulk viscosity and other material properties of the dark sector, as well as the spectrum of perturbations. If sufficiently large, this effect could account for the acceleration of the cosmological expansion. | ||
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